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Restructuring Costs (Schedule Of The Activity And Balances Associated With Restructuring Liabilities) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Restructuring Cost and Reserve [Line Items]
Beginning balance			$ 61us-gaap_RestructuringReserve
Ending balance	20us-gaap_RestructuringReserve	45us-gaap_RestructuringReserve	61us-gaap_RestructuringReserve
Other Current Liabilities [Member]
Restructuring Cost and Reserve [Line Items]
Beginning balance			52us-gaap_RestructuringReserve / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherCurrentLiabilitiesMember
Ending balance	13us-gaap_RestructuringReserve / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherCurrentLiabilitiesMember	27us-gaap_RestructuringReserve / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherCurrentLiabilitiesMember	52us-gaap_RestructuringReserve / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherCurrentLiabilitiesMember
Other Long-Term Liabilities [Member]
Restructuring Cost and Reserve [Line Items]
Beginning balance			9us-gaap_RestructuringReserve / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherNoncurrentLiabilitiesMember
Ending balance	7us-gaap_RestructuringReserve / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherNoncurrentLiabilitiesMember	18us-gaap_RestructuringReserve / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherNoncurrentLiabilitiesMember	9us-gaap_RestructuringReserve / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherNoncurrentLiabilitiesMember
Canadian Divestitures [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring reserve activity	4us-gaap_RestructuringReservePeriodIncreaseDecrease / us-gaap_RestructuringPlanAxis = dvn_CanadaDivestitureMember
Canadian Divestitures [Member] | Other Current Liabilities [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring reserve activity	4us-gaap_RestructuringReservePeriodIncreaseDecrease / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherCurrentLiabilitiesMember / us-gaap_RestructuringPlanAxis = dvn_CanadaDivestitureMember
Office Consolidation [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring reserve activity	(25)us-gaap_RestructuringReservePeriodIncreaseDecrease / us-gaap_RestructuringPlanAxis = dvn_OfficeConsolidationMember	(11)us-gaap_RestructuringReservePeriodIncreaseDecrease / us-gaap_RestructuringPlanAxis = dvn_OfficeConsolidationMember
Office Consolidation [Member] | Other Current Liabilities [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring reserve activity	(15)us-gaap_RestructuringReservePeriodIncreaseDecrease / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherCurrentLiabilitiesMember / us-gaap_RestructuringPlanAxis = dvn_OfficeConsolidationMember	(22)us-gaap_RestructuringReservePeriodIncreaseDecrease / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherCurrentLiabilitiesMember / us-gaap_RestructuringPlanAxis = dvn_OfficeConsolidationMember
Office Consolidation [Member] | Other Long-Term Liabilities [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring reserve activity	(10)us-gaap_RestructuringReservePeriodIncreaseDecrease / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherNoncurrentLiabilitiesMember / us-gaap_RestructuringPlanAxis = dvn_OfficeConsolidationMember	11us-gaap_RestructuringReservePeriodIncreaseDecrease / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherNoncurrentLiabilitiesMember / us-gaap_RestructuringPlanAxis = dvn_OfficeConsolidationMember
Offshore Divestiture [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring reserve activity	(4)us-gaap_RestructuringReservePeriodIncreaseDecrease / us-gaap_RestructuringPlanAxis = dvn_OffshoreDivestitureMember	(5)us-gaap_RestructuringReservePeriodIncreaseDecrease / us-gaap_RestructuringPlanAxis = dvn_OffshoreDivestitureMember
Offshore Divestiture [Member] | Other Current Liabilities [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring reserve activity	(3)us-gaap_RestructuringReservePeriodIncreaseDecrease / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherCurrentLiabilitiesMember / us-gaap_RestructuringPlanAxis = dvn_OffshoreDivestitureMember	(3)us-gaap_RestructuringReservePeriodIncreaseDecrease / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherCurrentLiabilitiesMember / us-gaap_RestructuringPlanAxis = dvn_OffshoreDivestitureMember
Offshore Divestiture [Member] | Other Long-Term Liabilities [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring reserve activity	$ (1)us-gaap_RestructuringReservePeriodIncreaseDecrease / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherNoncurrentLiabilitiesMember / us-gaap_RestructuringPlanAxis = dvn_OffshoreDivestitureMember	$ (2)us-gaap_RestructuringReservePeriodIncreaseDecrease / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherNoncurrentLiabilitiesMember / us-gaap_RestructuringPlanAxis = dvn_OffshoreDivestitureMember

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- Definition

Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 420

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SAB TOPIC 5.P.4(b))

-URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 5

-Section P

-Subsection 3, 4

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- Definition

Net total Increase or Decrease in the accrual for restructuring costs during the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 420

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SAB TOPIC 5.P.4(b))

-URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 5

-Section P

-Subsection 3, 4

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